I love my TK40 - for throw with a multi-die light, it is the best I have. Also no donut hole - the TK40 reflector does a really good job of projecting a bright hotspot very far, and also lots of wide-angle spill nearby.
I have an Ultrafire RL-2088 (Osram 6-die) which has more floody light but can't throw as far. From beamshots I've seen it appears the Pilot Whale has a similar beam profile, although possibly with more rings. Good for lighting up the whole near field, but won't throw as far.
I have several other multi-die LEDs (mostly cheap DX lights) but the only other MC-E I have that impresses me much is my Dereelight DB3 V3 with the MC-E pill and extension to use 2 18650's; it projects a wonderful floody beam quite well, but interestingly narrower than the spill on the TK40 and not as throwy in the center; still a very decent throw though, and with a big bright hotspot.
I have a Legion-II on the way, have to see how it stacks up.
At the moment, if I want to use an LED hand cannon, I pick up my TK40:twothumbs